US663033A - Galvanizing-furnace. - Google Patents

Description

No. 663,033. Patented Dec. 4, I900. H. B. LYNCH.

GALVANIZING FURNACE.

(Application filed June 2, 1899.) I (No Model.) 2 Sheets$heat I.

| l i l l I fizwe 03 TH: NORRIS wzrsns 0o, ruo'mumon wasnmnmu u c No. 663,033. Patented Dec. 4, I900. H. B. LYNCH.

GALVANIZING FURNACE.

(Application filed June 2, 1899.) (No Model.) 7 2 Sheets-Sheet 24 m: NORRIS PETERS coy, PNDTO-LITHOH wAsmNmTc-N, n cy Nirn HARRY B. LYNCH, OF VERSAILLES, PENNSYLVANIA.

GALVANIZJNG-FURNACE.

SPECIFICATION forming part of Letters Patent No. 663,033, dated December 4, 1900.

Application filed June 2, 1899. Serial No. 719,059. (No model.)

lowing to be a full, clear, and exact description thereof.

Myinvention relates to the heating of pots containing galvanizing or other metal used for coating. Its object is to provide a suit: able furnace for work of this character in which generator or like low quality of fuelcan be used and in which provision is.

made for varying the heat in the furnace so as to properly heat the metal in the pot; for applying the heat to the upper part of the metal in the pot, so as to avoid, as far as possible, the making of dross, which comes from overheating of the metal; forqnickly and rapidly coolingt he pot,which is a necessity as soon as the coating is discontinued, such as at the end of a days work, to prevent burning or oxidizing of the coating metal; for heating the incoming gases by the out-going product-s and to some extent for heating the air supporting combustion; to provide access to any of the gas-fines, both for cleaning or burning out and in case the pot should burn through so that the spelter or other metal would run down into the gas-fines, and for quickly collecting and withdrawing such metal from the fines, a necessity especially in the employment of pot-s used for coating long pipe and bar where a very large body of metal must be employed.

The particular points of invention desired to be covered will be hereinafter described in detail and claimed.

To enable others skilled in the art to make and use my in vention, I will describe the same more fully, referring to the accompanying drawings, in which Figure 1 is a horizontal section of. the furnace and pot on the line 1 1, Fig. 2. Fig. 2 is in part a side view and in part a section, being made on the line 2 2, Fig. 1; and Figs. 3 and 4 are cross-sections on the lines 3 3 and 4 4, respectively, Fig. 1.

Like letters indicate like part-s in each of the figures.

My inventionis applied to the same class of furnace as shown in Patent No. 419,695, granted upon my invention January 21, 1890, which provides for the use of natural gas or other high-heating gas; but the present furnace is constructed so as to utilize for heating a low-heating gas, generally known as producer or generator gas, which is formed continuously by the passage of air through a body of fuel and which requires different conditions for working from such rich gases as can be carried to the furnace in ordinary pipes.

The furnace shown is one suitable for the coating of pipe or bar and is therefore made of considerable length, the ordinary wroughtmetal pipe being about eighteen to twenty feet in length and the furnace being made somewhat longer to provide for the proper handling of the pipe. While the pot is made comparatively long, it is narrow, as shown, though the pot illustrated is wider than the usual pots, because the pot A has a chargingsection a and a withdrawing-section 1), these sections being separated by a longitudinallyextending partition 0 entering from above part way into the metal of the pot, and the section a containing the sal-ammoniac or other like material through which it is considered desirable to introduce the pipe into the coating-bath. The pot A is formed of wrought metal in the usual way, and though it may contain peculiar mechanism for the handling of the pipe the same forms no part of the present invention and is not illustrated, the pot showing simply the inclined guide-bars a from the charging-section into the withdrawing-seotion. The pot A rests upon the supporting-wall D, through which the waste-gas due or fines (1 pass, it being preferred, for the proper working of the furnace and also to bring the same as close as practicable to the gas-fines, that the wastegas flue shall be divided centrally into two sections d d by the wall (1 The waste-gas flue extends for the full length of the furnace. On each side of this waste-gas flue, separated therefrom by the walls 6 are the gas-supply flues ee' orff. Asillustratedin the drawings, these fiues extend in from opposite ends of the furnace toward each other, the tines e and f being on one side of the furnace and meeting between the ends and being separated by furnace.

the wall a one flue being preferably shorter than the other, as shown, in the proper work'- ing of the furnace, and the flues ef being on the other side of the furnace and located in like manner. It will be noted that these flues are open and that the bases thereof are inclined downwardly and outwardly toward the outer walls 9 of the furnace. Open fines are formed because of the liability of the pets to burn out and discharge the spelteror metal into the combustion-chambers, from which it will pass'into these lines, and the inclined bases thereof provide means for tapping the metal from such fines and collecting it without the necessity of tearing down the entire For this purpose it will be noted that at intervals in the walls 9 are pockets or recesses g,extending from the fines toward the outer face of the wall, into which such metal will naturally gather and from which it can be tapped by withdrawing the brickwork closing such pockets. The several gasfiues are controlled by suitable gas-valves f located at the ends of the furnace. The masonry inclosing the gas-fines and the wasteproduct flues extends up about on a line with the base of the pot, and extending longitudinally. of the pot and from the base thereof up to the top thereof on each side are the series of combustion-chambers h h k it, these series of chambers corresponding in length and position to the gas-supply flues e e f f ,respectively, the series h k and h respectively, being separated by the walls h as shown in Fig. 1, while the individual chambers of each series are separated by the walls h Leading upwardly from the gas-supply flues and opening into the bases of the combustion-chambers are the gas-supply ports 2', one for each combustion-chamber, while the air ports Z enter horizontally into the bases of the combustion-chambers, as shown in Fig. 3. It will be noted that to protect the base of the pot I form the tile sheathing i, which deflects the gas upwardly toward the upper end of the combustion-chamber, the airpassing over the top of the gas-fines and meeting the gas as it rises throughthe ports 1' and forming combustion in the chambers 71 h k is. The bases of the air-flues are flat, as shown, and supported in the same are the tiles t in position to be slid over the gas-port 11 and close the same, so regulating the supply of gas from each port to the combustion-chamber. I prefer for the purpose of heating the incoming air to form along the sides of the furnace the air-chambers m m, which are formed by means of the vertical walls m supported on pillars m upon which metal bar-supports m rest, the tops of said chambers being closed by the tiles m resting on the walls m and on brickwork projecting from the sides of the furnace. the pillars m rises in contact with the inclosing wall, absorbing heat therefrom before it enters the horizontal air-fines 1. These airflues themselves are, however, maintained at In this way the air enters betweenconsiderable heat both by the initial combustion in the combustion-chambers and also by the gases in the escape-fines pp 1' 0", into which the products pass from the combustionchambershhk lcthroughthefiues fi Where such outer air-chambers m m are employed, suitable ports 'm are formed through the same to provide for adjusting the tiles '5 over the gas-ports 1', these ports m being closed by blocks. The gas and air after meeting at the bases of the combustion chambers is burned therein, and the flame and heated products travel upwardly along the pot and within the combustion-chambers, and thence through the ports p into the longitudinallyextending escape-fines p p 'r 0" above referred to. These fines are made of the same length as the respective gas-fines and series of combustion flues above described, the chambers p p r 1* being separated by the partition-walls b above referred to. In this way each particular section of the furnace is under the control of the operator through the valve f controlling the supply of gases thereto, and the heat of the pot can be regulated by the admission of more or less gas to each section, the gas passing from the gas supply flue of each section into its combustion-chamber, and thence into its escapeof order the other three sections may be utilized to keep up the heat and provide for the running of the pot, though of course not as perfectly as where the heat can be regulated as above described.

It will be noted that at each end of the furnace is the transverse escape-flue s or 8', extending for the full width of the furnace, the escape-fines p 10 Opening into the fine 3 and the escape-fines r r opening into the fine 5.

These flues s and s communicate by downtake-openings into the waste-product flue or tunnel d, and the waste products from the fiues p 10 enter the flue s and travel forward under the pot and for its entire length traveling through the tunnels or ports d d or the single tunnel d in contact with the partitionwalls 6 separating the same from the gasflues and serving in this way to heat the incoming gases, such waste products then passing to the stack T. For the proper heating and working of the furnace it is found desirable that the sections of the tunnel 61 shall be controlled so as to throw greater or less heat into contact with one or the other gasflue, and for this purpose the partition-wall A further important advantage (1 between the two fines d d is carried longitudinally and centrally across below the flue s, as shown particularly at tin Fig. 4, the upper end of said wall being preferably spread so as to support the tile-plate t, which can be adjusted from side to side, so as to close the port 1? or 15 leading from said crossflue .9 down into the tunnel-fines d or d It will also be noticed that the end walls a of the pot are exposed to the heat within the cross-fines s or s. This is important in providing for maintaining the heat at the ends of the pots, where on account of the handling of the pipe the metal is liable to be cooled. In this way a high heat can always be main- \ained at the end portions of the pot and the chilling action of the metal consequent to its agitation be overcome.

\Vhen the furnace is in operation, the incoming gas enters the gas flues or tunnels e f e f and rises through the ports 13, meeting the air entering through the air-ports Z and burning in the bases of the combustion-chambers 71, 7t 77/ 7c, rising therein in contact with the pot-walls, and thence passing horizontally into the fines 1) r17 1", through which they pass to the end or cross flues s or s and into the waste-product tunnel or tunnels, the heated products from the cross-flue s traveling forward through the same in contact with the dividing-walls 6 between the same and the gas-flue, so as to heat the incoming gas. In this way it is found that the necessary heat for these galvanizing or like pots can be maintained without any further heating of the producer-gas and that the heat of the pot can be regulated so that the metal can be kept in perfect condition for working while the heat is not so high as to rapidlyburn through the walls of the pot and destroy the same, a difficulty found in the heating of these pots with rich gas and which must be carefully guarded against. The heat can also be regulated in the different sections, as above described, so that the metal is maintainedin as nearly perfect condition as possible for coating, while themetal at the ends of the pot is also heated through the exposure of the end portions thereof within the end or cross fines. Practical use has shown it desirable that the rear sections supplied with gas from the fines e 6 shall be made longer than those supplied with gas from the flues ff on account of the peculiar working of the pot and the necessity of maintaining the withdrawing end somewhat hotter than the other end. I

A very important point in the operation of these furnaces is to prevent the drossing of the metal in rapid working of the furnace where a large tonnage is coated per day. It is necessary in so working to maintain the metal quite hot, keeping it cool by the rapid passing of the pipe through the same, the pipe absorbing the heat from the metal, it being found that the pipe must be raised to a certain temperature before the coating metal willpermanentlyunitetherewith. Onegreat difficulty with this way of working, however, is that where the furnace is run at such high heat as to keep the metal hot enough for this rapid work as soon as the coating operation is discontinued the furnace will overheat the metal in the pot and lead to very serious loss in drossing or oxidizing. The present furnace has great advantages in overcoming such difficulties, as the operator need only close off the gas-supply and open the stack wide, when the draft or suction of the same will draw the air in through the air-chambersmm and the air-fines Z into the combust-ion-ehambers and into contact with the pot, so providing for the rapid, cooling down of the pot the instant that the gas-supply is cut off.

What I claim my invention, and desire to secure by Letters Patent, is-

1. A furnace for galvanizing and like pots having longitudinally-extending gas-supply flues on each side of and below the level of the pot, combustionchambers on each side of the pot and extending up the walls thereof, outlet-fines extending longitudinally of the pot outside of the combustion-chambers, and gas-ports leading from the gas-supply fines vertically into the combustion-chambers and air-supply ports leadinghorizontally into the same, substantially as set forth.

2. A furnace for galvanizing and like pots, having longitudinally-extending gas-supply fines on each side of and below the level of the pot, com bustion-chambers on each side of the pot and extending up the walls thereof, outlet fiues extending longitudinally of the pot outside of the combustion-chainbers, gasports leading from the gas-supply fines vertically into the combustion-chambers and airsupply ports leading horizontally into the same, and sliding tiles in the air-ports for regulating the gas-ports, substantially as set forth.

3. A furnace for galvanizing and like pots, having longitudinallyextending gas-supply flues on each side of and below the level of the pot, combustion-chambers on each side of the pot and extendingup the walls thereof, outlet-fines extending longitudinally of the pot outside of the combustion-chambers, gasports leading from the gas-supply fines vertically into the combustion-chambers and airsupply ports leading horizontally into the same, a cross-port at the end of the furnace with which the outlet-ports communicate and a tunnel escape-fine extending longitudinally under the pot, substantially as set forth.

4:. A furnace for galvanizing and like pots, having a substructure supporting the pot provided with a longitudinally-extending waste-product tunnel under the same and longitudinally-extending gas-fines on each side of said tunnel, combustion-chambers on each side of the pot, gas-ports leading from the gas-fines upwardly into the combustionchambers, and fines connecting the combustion-chambers with the waste-product tunnel, substantially as set forth.

IIO

5. A furnace for galvanizing or like pots, having a substructure supporting the pot and provided with gas-fines extending longitudi-.

nally thereof and having floors inclined outward-1y and downwardly, combustion-chambers extending along the sides of the pot and gas-supply ports leading upwardly from the gas-fines into said combustion-chambers, substantially as setforth.

6. A furnace for galvanizing or like pots, having a substructure supporting the pot and provided with gas-fines extending longitudi-.

nally thereof and having floors inclined outwardly and downwardly, combustion-chambers extending along the sides of the pot, gassupply ports leading upwardly from the gasflues into said combustionchambers, and pockets in the gas-fines extending part way through the side walls, substantially as set forth.

7. A furnace for galvanizing and like pots, having gas-supply lines on each side of and below the level of the pot, combustion-chambers on each side of the pot and extending up the walls thereof, outlet-fines extending longitudinally of the pot outside of the combustion-chambers, gas'ports leading from the gas-supply flues vertically into the combustion-chambers and air-supply ports leading horizontally into the same, and air-cnam hers extending longitudinally of the furnace outside the gas-supply fines and communicating with the air-ports, substantially as set forth.

8. A furnace for galvanizing or like pots, having on each side thereof below the level of the same, longitudinal gas-supply flues, each extending part way of the length of the furnace, combustion chambers extending along the sides of the pot, ports leading from the respective gas-supply fiues vertically into said combustion chambers, and longitudinally-extending outlet-fines outside the combustion-chambers and communicating therewith, each gas-supply flue having its own combustion-chambers and outlet-flue, substantially as set forth.

9. A furnace for galvanizing or like pots, having longitudinally-extending gas-supply lines below the level of the pot and extending part way of its length, combustion-chambers extending along the sides of the pot, ports leading from the gas-supply flues into the respective combustion chambers, air ports leading horizontally into the combustionchambers, longitudinally-extending outletflues with which the respective combustionchambers communicate, an escape-tunnel, and cross-fines communicating with the outlet-fines and opening downwardly into the escape-tunnel, substantially as set forth.

l0. A furnace for galvanizing or like pots, having longitudinally-extending gas-supply lines below the level of the pot, combustionchambers extending along the sides of the pot, ports leading from the gas-supply lines into the combustion chambers, longitudinally-extending outlet-fines outside the combustion-chambers with which they communicate, an escape-tunnel, and a cross-flue communicating with the outletlines and opening downwardly into the escape-tunnel, the end wall of the pot being exposed within such cross-flue, substantially as set forth.

11. A furnace for galvanizing or like pots, having longitudinally-extending gas-supply flues e, 6 below the level of the pot,-and extending part way of its length, combustionchambers h, h extending along the sides of the pot, ports 2', leading from each gas-sun ply flue into the respective combustion-chambers, air-ports Z, longitudinally-extending outlet-fines p, p with which the respective com bustion-chambers communicate, a wasteproduct tunnel extending longitudinally under the pot, and a cross-flue 8, com municating with the outlet-fines and opening downwardly into the waste-product tunnel, substantially as set forth.

12. .A furnace for galvanizing or like pots, having longitudinally-extending gas-supply flues below the level of the pot, combustionchambers extending along the sides of the pot, ports leading from the gas-supply flues into the combustion chambers, longitudinally-extending outlet-fines with which the respective combustion-chambers communicate, a waste-product tunnel extending longitudinally under the pot, a cross-flue communicating with the outlet-fines and opening downwardly into the waste-product tunnel, the wall (1 dividing the waste-product tunnel into two sections and having the portion t extending under the cross-flue, and the deflecting-plate 25 supported on the wall 15, substantially as set forth.

In testimony whereof I, the said HARRY B. LYNCH, have hereunto set my hand.

HARRY B. LYNCH.

Witnesses:

FRANCES D. SooTT, ROBERT C. TOTTEN.

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